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The worst performances given were Foxnews.com, IGN.com, Gamespot.com, CNN.com, Break.com and ESPN.go.com.

The best performances were by Google.com, Live.com, Orkut.com and Craigslist.org. This is not entirely surprising considering their minimalistic style, said Pingdom.

Pingdom said heavily designed sites faired poorly in the tests. One in 10 of the websites weighed in at over 1Mbyte in size if no content had been previously cached. Some of the pages were more than 2Mbytes in size.

Sites with the heaviest design included NBA.com, MLB.com, IGN.com, WorldofWarcraft.com, Gamespot.com, Adobe.com, Target.com and CNN.com, which were affected by a large number of images and too many Flash objects.

Each separate object on a web page requires an HTTP request to the web server to retrieve it to the web browser, so using a lot of HTTP requests is a sure way to slow down a website.

Out of the 100 websites in the survey, 19 used more than 100 HTTP requests. Three used more than 200.

Although cached content can help site visitors, Yahoo estimates that 20% of page views do not use cached content, said Pingdom.

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